package com.hmall.item.service.impl;

import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmall.item.mapper.ItemMapper;
import com.hmall.item.pojo.Item;
import com.hmall.item.service.IItemService;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

@Service
public class ItemService extends ServiceImpl<ItemMapper, Item> implements IItemService {

    @Autowired
    RabbitTemplate rabbitTemplate;

    @Transactional
    @Override
    public void updateStatus(Long id, Integer status) {
        this.update(Wrappers.<Item>lambdaUpdate().eq(Item::getId,id).set(Item::getStatus,status));

        String routingKey = status == 1 ? "item.up" : "item.down" ;
        //发送消息到MQ
        rabbitTemplate.convertAndSend("item.topic",routingKey,id);
    }

    @Transactional
    @Override
    public void deductStock(Long itemId, Integer num) {
        try {
            update().setSql("stock = stock -" + num).eq("id",itemId).update();
        } catch (Exception exception) {
            throw new RuntimeException("库存不足");
        }
    }

}
